<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="./js/vue.js"></script>
</head>
<body>

<!--v-pre 保证标签内容不被解析-->
  <div id="app">
      <h2>{{message}}</h2>
      <h2 v-pre>{{message}}</h2>
  </div>

<script>
    let mv = new Vue({
        el: "#app",
        data: {
            message: "消息来了"
        }
    })
</script>
</body>
</html>